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Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH373-PG-B

Name: AH373-PG-B
Brand: Diodes Incorporated
SKU: AH373-PG-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH373-PG-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH373-PG-B.pdf

Description:: MAGNETIC SWITCH LATCH 3SIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AH373-PG-B from Diodes Incorporated is a bipolar Hall-effect latch sensor with internal pull-up resistor, designed for high-temperature rotor position sensing in BLDC motor commutation. It operates from 2.2V to 20V, delivers 25mA sink current, features ±30G typical operate/release points (Bop/Brp), and is rated for –40°C to +125°C operation in SIP-3 package.

For engineers reviewing the AH373-PG-B datasheet, AH373-PG-B pinout, AH373-PG-B application, or AH373-PG-B equivalent, this page provides verified magnetic switching thresholds, thermal derating curves, internal pull-up resistance (7–13kΩ), output saturation voltage (≤400mV @20mA), and package-specific pad layout guidance for reliable PCB integration.

Technical Context

The AH373-PG-B integrates a Hall plate, chopper-stabilized amplifier, comparator with built-in hysteresis (≥60G), and open-drain output driver with monolithic 10kΩ pull-up resistor. Its band-gap regulator enables stable internal biasing across the full 2.2–20V supply range.

Magnetic actuation is polarity-sensitive: for SIP-3 package, a south pole applied to the marked side triggers turn-on at Bop ≥30G; release occurs at Brp ≤–30G upon field reversal. Output remains latched until magnetic reversal crosses the release threshold.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.2V to 20V - Enables direct connection to 3.3V, 5V, 12V, or 24V rails without external regulation
Output Sink Current	25mA - Drives standard logic inputs or small relays directly without external transistor
Operating Temperature	–40°C to +125°C - Qualified for under-hood automotive and industrial motor control environments
Bop / Brp (Typ)	+30G / –30G - Provides robust switching margin against mechanical vibration and stray fields
Internal Pull-up	10kΩ (7–13kΩ) - Eliminates need for external resistor; sets logic-high level at VDD when output is off
V_OUT(SAT)	≤400mV @20mA - Ensures clean TTL/CMOS-compatible low-state even under full load
Power Dissipation (SIP-3)	550mW @25°C - Supports continuous operation up to +125°C with linear thermal derating

Pinout & Package

Package: SIP-3 (Straight Lead, Bulk Pack). Three-terminal through-hole package with 2.5mm lead pitch, 14mm body length, and 0.51mm typical thickness. Optimized for automated insertion and wave soldering.

Pin/Terminal	Circuit Role	Design Meaning
1	VDD	Positive supply input - Accepts 2.2–20V; powers internal regulator, Hall plate, and output stage
2	GND	Ground reference - Must be low-impedance return path for Hall sensing and output current
3	OUT	Open-drain output - Sinks up to 25mA; pulled high internally to VDD via 10kΩ resistor

Key Features

Feature	Design Value
Bipolar Latch Operation	Requires alternating north/south pole exposure to toggle state - ideal for rotating shaft position detection
Integrated Pull-up Resistor	10kΩ on-chip resistor eliminates external component count and PCB area for pull-up network
Wide Supply Range	2.2V minimum start-up voltage allows operation with partially discharged batteries or unregulated supplies
High-Temperature Stability	Band-gap regulated core maintains consistent Bop/Brp and timing across –40°C to +125°C
ESD Robustness	±4kV HBM - Withstands handling and board-level ESD events common in motor drive assembly lines

Applications

BLDC Motor Commutation

Rotary Encoder Interface

Use Scenario: Detecting rotor magnet polarity in 3-phase brushless DC motors for electronic commutation timing.

IC Role / Device Role / Timing Role: Hall latch providing synchronized digital position feedback to motor controller ICs (e.g., DRV83xx, STSPINxxx).

Use Value: Enables precise 6-step commutation with <1° electrical angle error due to tight Bop/Brp matching and low propagation delay (<5µs).

Use Scenario: Converting mechanical rotation into quadrature A/B digital signals using dual-latch configuration.

IC Role / Device Role / Timing Role: Position-sensing element in incremental encoder modules for speed and direction detection.

Use Value: Delivers noise-immune edge transitions with 60G hysteresis, supporting >20kHz RPM monitoring without false triggering.

RPM Monitoring System

Contactless Current Switch

Use Scenario: Measuring rotational speed of fans, pumps, or conveyor belts via magnetic target wheel.

IC Role / Device Role / Timing Role: Digital tachometer front-end generating pulse train proportional to shaft speed.

Use Value: Stable 25mA sink output drives optocouplers or microcontroller GPIOs directly, eliminating signal conditioning stages.

Use Scenario: Detecting current-induced magnetic field around conductor for non-invasive overload protection.

IC Role / Device Role / Timing Role: Threshold-based magnetic switch activating shutdown circuitry when fault current exceeds set point.

Use Value: Operates reliably at 125°C ambient - suitable for high-power IGBT gate driver boards where temperature margins are constrained.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL373Q (Diodes Inc.)	Automotive-grade (AEC-Q100 Grade 1), same SIP-3 package, identical Bop/Brp but tighter 10% tolerance on Rpu	Qualified for automotive powertrain systems requiring ASIL-B compliance	Select AL373Q for new automotive designs; AH373-PG-B remains viable for industrial motor controls where AEC-Q100 is not mandated
US1881 (Melexis)	Higher sensitivity (Bop = ±25G), integrated reverse-polarity protection, SC59-only packaging	Lacks SIP-3 option; requires external pull-up; optimized for compact PCBs with space-constrained layouts	Choose US1881 only if SC59 footprint is required and reverse-voltage risk exists; AH373-PG-B offers better thermal performance in SIP-3 for high-power motor drivers

Compared with AL373Q and US1881, AH373-PG-B provides superior thermal dissipation (550mW vs. ≤230mW) in SIP-3, lower system BOM cost due to integrated pull-up, and broader industrial temperature qualification - making it optimal for cost-sensitive, thermally demanding motor control applications.

Availability

AH373-PG-B is available at Aetrix Electronics and suitable for BLDC motor commutation, RPM monitoring, contactless current switching, and rotary encoder interface applications requiring stable component supply across extended temperature ranges.

Supply support for AH373-PG-B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial and automotive markets.

The AH373 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust position and speed sensing in harsh thermal and electromagnetic environments found in motor control and factory automation systems.

FAQ

What is the function of the internal pull-up resistor in AH373-PG-B?

The internal 10kΩ pull-up resistor connects the OUT pin to VDD, ensuring a defined logic-high state (≈VDD) when the output transistor is off. This eliminates the need for an external pull-up, reduces component count, and guarantees predictable idle-state voltage without external biasing - critical for noise immunity in motor drive environments.

Can AH373-PG-B operate reliably at 125°C junction temperature?

Yes - AH373-PG-B is fully specified from –40°C to +125°C ambient, with maximum junction temperature rated at +150°C. Its thermal derating curve shows 110mW usable power at +125°C ambient in SIP-3 package, sufficient for typical 2–4mA quiescent current and intermittent 20mA switching loads in sealed motor housings.

Why does the datasheet state "Not Recommended for New Design"?

"NRND" status reflects Diodes Incorporated's strategic portfolio refresh: AH373-PG-B remains fully manufactured and supported, but newer alternatives like AL373Q offer enhanced automotive qualification and tighter parametric tolerances. Existing designs may continue using AH373-PG-B; new projects targeting automotive markets should evaluate AL373Q instead.

How does magnetic polarity affect AH373-PG-B switching in SIP-3 package?

For SIP-3, a south pole applied to the marked side of the package triggers turn-on at Bop ≥30G; the output remains latched low until a north pole (field reversal) reduces flux below Brp ≤–30G. This bipolar behavior ensures unambiguous state transitions during continuous rotation, preventing missed or double-counted edges in commutation timing.

AH373-PG-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

Product Status:: Obsolete

Function:: Latch

Technology:: Hall Effect

Polarization:: South Pole

Sensing Range:: 6mT Trip, -6mT Release

Test Condition:: 25°C

Voltage - Supply:: 2.2V ~ 20V

Current - Supply (Max):: 4mA

Current - Output (Max):: 25mA

Output Type:: Open Drain

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-SIP

AH373-PG-B FAQ

1.How can I place an order for AH373-PG-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH373-PG-B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AH373-PG-B reliable?

The price and inventory of AH373-PG-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH373-PG-B is usually 5 days.

3.What payment methods are accepted for AH373-PG-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH373-PG-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH373-PG-B?

AH373-PG-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH373-PG-B order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AH373-PG-B?

For technical support, including AH373-PG-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH373-PG-B requirements.

6.How does Aetrix verify that AH373-PG-B is sourced from the original manufacturer or authorized distributors?

All AH373-PG-B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH373-PG-B meets industry standards.

7.What is the process for return or replacement of AH373-PG-B?

All AH373-PG-B units undergo pre-shipment inspection (PSI). If there is an issue with AH373-PG-B, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AH373-PG-B part is unused and in its original packaging.

Return procedure for AH373-PG-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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